Pure energy can linger eternally in time and not know it.
Energy is a (physical ) property of an object. If the "void" had some form of energy then the void and the energy that described it always existed, hence, something always existed. And that something cannot be called nothing.
Nothing is very easy to understand. It simply means non existent, no properties, no energy -nothing.
Void is a very deceptive term to use if used to describe non existence. The term void implies something more than non existent, perhaps a condition of emptiness or vacuum.
My guess is that at some point in time nothing existed, no energy, no void,
(By the way great posts!!) -as usual.